Along with Caetano Veloso and Gilberto Gil, the band Os Mutantes (Sérgio Dias, Arnaldo Baptista, Ronaldo "Dinho" Leme, and Rita Lee) were key figures in Brazil's Tropicália movement of the late 1960s, fusing psychedelic rock with elements of bossa nova. At this intense, magical reunion concert, they performed together for the first time since 1973, with vocalist Zélia Duncan sitting in for Rita Lee.